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Finding the Fourth Proportional to 71,818.80, 99,109 and 42,010.80

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Solution

The fourth proportional to 71,818.80, 99,109 and 42,010.80 is: 57,974.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,818.80 : 99,109 = 42,010.80 : x
  2. Step 2: Convert to fraction form
    71,818.80/99,109 = 42,010.80/x
  3. Step 3: Cross multiply
    71,818.80x = 99,109 × 42,010.80
  4. Step 4: Simplify right side
    71,818.80x = 4,163,648,377.20
  5. Step 5: Solve for x
    x = 4,163,648,377.20/71,818.80
  6. Step 6: Final answer
    x = 57,974.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.